The Transport Workers Union (TWU) says it is appalled about the time it has taken for authorities to act on concerns about the operations of north Queensland trucking company, Blenners Transport.

Four senior staff from Blenners Transport are due today in the Tully Magistrates Court, south of Cairns, on more than 700 charges.

The charges include breaching the conditions of a national fatigue management scheme.

TWU state secretary Peter Biagini says the company's fatigue accreditation should be suspended while the case is being heard.

"If you lose points, they suspended your licence to make sure the roads are safe and they should be doing the same thing here," he said.

"I know they're a large employer in the north but the important thing is make sure our roads are safe."

Mr Biagini says the company's drivers should work standard hours until the case is finalised.

"I'm not saying they should be shut down and not able to do their work or anything, what I'm [is] saying by losing their accreditation, they go back to the normal fatigue driving hours which is the maximum 12 hours," he said.